1 Department of Echocardiography, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 100045, China.
2 Department of Echocardiography, Beijing Anzhen Hospital, Capital Medical University, and Beijing Institute of Heart, Lung and Blood Vessel Disease, Beijing, 100029, China.
3 Department of Radiology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 100045, China.
4 Department of Echocardiography, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 100045, China. echo_mn@163.com.
5 Department of Echocardiography, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 100045, China. wfyy1026@sina.com.